It important to assess flexibility both before and during a workout regimen because to assess flexibility progress.
What is a flexibility exercise?Flexibility exercises, as the name implies, help to increase the stretch of the muscles, improving the range of motion. More flexibility is also important to help prevent possible post-workout soreness.
In this case we have that the reason to continue doing stretching before and during the exercises is about to assess flexibility progress.
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Answer:
A
Explanation:
pls help in these 2 questions
Answer:
Taking forces along the plane
F cos θ - M g sin θ -100 = M a net of forces along the plane
F = (M a + M g * .5 + 100) / .866 solving for F
F = (80 * 1.5 + 80 * 9.8 * .5 + 100) / .866 = 707 N
F = 707 N acting along the plane
Fn = F sin θ + M g cos θ forces acting perpendicular to plane
Fn = 707 * 1/2 + 80 * 9.8 * .866 = 1030 Newtons forces normal to plane
(this would give a coefficient of friction of 100 / 1030 = .097 = Fn)
Light of different wavelengths look different ______ to humans:
A.) visible spectrum
B.) electromagnetic spectrum
C.) colors
D.) absorption
Answer:
C) colors
Explanation:
The wavelengths of light determine the color that we see. Humans cannot see lightwave absorption, but we can see light in the form of colors.
Shorter wavelengths (indicating higher frequencies) look violet,
and Longer wavelengths (indicating lower frequencies) look more red
White light is passed through a filter that only allows only yellow, green and blue light to pass through onto a piece of blue fabric. what color does the fabric appear to have under this light?
a.
red
c.
blue
b.
green
d.
black
Answer:
White light contains yellow, green, and blue - only the blue light will be reflected giving the blue color.
So the green and yellow light thru the filter will not be reflected and the fabric will still appear blue.
blue is correct
If a proton and an electron are released when they are 2.0 * 10-10 m apart (a typical atomic distance), find the initial acceleration of each particle.
The initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
What is electrostatic force?The electrostatic force F between two charged objects placed distance apart is directly proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between them.
F = kq₁q₂/r²
where k = 9 x 10⁹ N.m²/C²
Given is the charge on proton and electron is q =1.6 x 10⁻¹⁹ C, distance r =2 x 10⁻¹⁰m , then the force will be
F = k q²/r²
Substituting the above values in the formula, we get the electrostatic force,
F = (9 x 10⁹) (1.6 x 10⁻¹⁹)²/(2 x 10⁻¹⁰)²
F = 5.76 x 10⁻⁹ N
The acceleration of electron when both proton and electron released is
acceleration = electrostatic force / mass of electron
Putting the values, we have initial acceleration of electron
a = (5.76 x 10⁻⁹)/(9.1 x 10⁻³¹)
a = 6.33 x 10²¹ m/s²
The acceleration of proton is due to the electrostatic force of attraction between proton and electron is given by
acceleration = electrostatic force / mass of proton
inserting the values, we get the initial acceleration
a '= (5.76 x 10⁻⁹)/( 1.67 x 10⁻²⁷)
a'= 3.45 x 10¹⁸ m/s²
Thus, initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
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A block and a ball have the same inertia and move with the same initial velocity across a floor and then encounter different ramps. The ramps are identical in every way except for the fact that there is enough friction for the ball to roll without slipping and the block slides without friction up the ramp. Which one makes it furthest up the ramp
The ball rolling without slipping will make it furthest up the ramp because it has greater kinetic energy.
Conservation of energy
The height rolled by each object can be determined by applying the principle of conservation of energy.
The ball rolling without slipping will have additional rotational kinetic energy.
The block won't have additional rotational kinetic energy.
Total K.E ball > Total K.K block
ΔP.E = ΔK.E
Thus, the ball rolling without slipping will make it furthest up the ramp because it has greater kinetic energy.
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Question 8
If a cheetah can run at a speed of 100 km/h for the initial 500 m of its chase, h
much time would it take to catch its prey that is at a distance of 100 m?
O 1.5 s
O 2.3s
O 3.6s
O 4.8s
Answer:
3.6 s
Explanation:
100 km/hr =27.77 m/s
100/27.77=3.6 sec
An electrolyte is . . . . .
question 2 options:
a compound which produces ions dissolved in a solution that do not conduct electric current
a compound which produces ions dissolved in a solution that conduct electric current
only positive ions in solution
a substance which is not important to the human body
Answer:
b) a compound which produces ions dissolved in a solution that conduct electricity.
NaCl is an electrolyte.
Can someone please answer this, ill give you brainliest Would be very appreciated.
[tex]{\large{\red{\mapsto{\maltese{\underline{\green{\boxed{\blue{\underbrace{\overbrace{\pink{\pmb{\bf{Answer:}}}}}}}}}}}}}}[/tex]
Weather
Explanation:
As during climate only one season change to another and it's a long period of time
while in weather it's can change into any season for few days depending on the relief of the area.
Answer:
weather
Explanation:
There is often confusion between weather and climate. Weather is the condition of the atmosphere at a particular place over a short period of time.
In Alberta, which of the following statements is true?
A. Only adults must be restrained in a vehicle.
B.All children must have booster seats.
C.Babies must be restrained in the front seat only.
D.All occupants must be restrained in a vehicle.
Consider a man walking around a house in a rectangle pattern. He walks 70 feet across the front, 30 feet along the side, 70 feet along the back, and 30 feet along the other side o bring him back to where he began. How much distance did this man cover?
200 feet
100 feet
140 feet
70 feet
Answer:
200ft
Explanation:
To find out how much distance the man covered, you need to find the perimeter of the rectangle. To find the perimeter of a rectangle, the formula is:
P = (L + H) × 2
Step 1
Plug in the values for L and H.
P = (70 + 30) × 2
Step 2
Add 70 and 30, because you need to add parentheses first.
P = (100) × 2
Step 3
Remove parentheses, and multiply 100 by 2.
P = 100 × 2
P = 200
Thus, the man walked 200 feet in distance.
Which telescopes must be placed in orbit around earth in order to observe short-wavelength radiation?.
Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.
What is telescope?A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.
When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.
Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.
To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.
Hence, space telescope is the correct answer.
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HELP PLEASE
A bicyclist travels 10 km in half an hour then rests for half an hour, then travels 50 km in three hours. What was the bicyclist’s average speed over the entire trip?
How long would it take an object traveling 12 m/s to go 60 m?
If a car travels 60km/hr, how long would it take the car to travel 300km?
answer:
Xi + Xf =10km+30km=60km[tex] v \times \frac{x}{t} [/tex]a man pulls a sled horizonally by exerting 64 Lb on teh rope that is tied to its front endd. if the rope makes an angle of 45 dgrees with horizontal, find the work done in moving teh sled 35 feet
The work done in moving the sled 35 feet when force is aligned from the horizontal is 1583.9 lb.ft
What is work done?Work done is equal to product of force applied and distance moved.
Work = Force x Distance
W = Fs cos θ
Given is the distance d =35 ft ,the force exerted F = 64lb and the angle of force from the horizontal direction is 45°.
Substituting the values, work done will be
W =64 x 35x cos 45°
W = 1583.9 lb.ft
Thus, the work done will be 1583.9 lb.ft
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The diagram shows a roller-coaster track. Assume that the system is closed. At point D, the roller-coaster is upside-down and at the top of the vertical loop.
which statement best describes the potential and kinetic energies of a roller-coaster car at point D?
How do u solve this with steps really need help asap
Answer:
170 N
Explanation:
Impulse is the change in momentum. Momentum is the product of mass and velocity. These are related to applied force by ...
F·Δt = m·Δv
__
Here, the velocity goes from 0 to 34 m/s in 0.0116 s. The mass is 0.058 kg. Filling in the given values, we have ...
F(0.0116 s) = (0.058 kg)(34 m/s)
F = 0.058×34/0.0116 kg·m/s² ≈ 170 N
The required force is 170 newtons.
When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be ___.
When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.
What is type S fuse?
Type S fuses are also called tamper proof fuses because each fuse size has a different base and thread size.
These fuses also require the use of a special adapter which is screwed into the standard Edison base of the fuse holder.
Thus, when plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.
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When charging a fully depleted battery with a 220/240-volt charging dock, 2023 leaf s can be fully charged in about ________.
When charging a fully depleted battery with a 220/240-volt charging dock, Nissan LEAF can be fully charged in about 7.5h.
What is battery?It converts the electro chemical energy to the electrical energy when connected across the two ends of the conductor.
The Nissan LEAF comprises of a standard 120-V charging cable. In order to charge it fully, we need a 220/240Volts battery. The time take take n to fully charge is 7.5 hours.
Thus, when charging a fully depleted battery with a 220/240-volt charging dock, Nissan LEAF can be fully charged in about 7.5 h.
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Chris shines a white light onto a surface, and the surface appears to be green. What color will the surface appear if he shines a combination of blue and green light on the surface?.
Answer: just realized this is more advanced physics so if this doesn't seem right I apologize, I had a really bad physics teacher lol. So ignore this for now!
Hey there! I think this might just be basic color mixing! The color would be a turquoise
Explanation: R G B make up our visible light spectrum. This has documented graphs. Through basic use of one, you can determine that the color would be a blue-green, commonly referred to as turquoise! There are many more color combinations then just this one as well!
Please heelllllpppppppppppopppppop
Answer:
Explanation:
I'm assuming you need this answer quickly.
Using what we know:
The energy of a single 400 nm photon is 3.1 eV.
So a photon of 412 nm wavelength would have the energy of 4.0 ev.
200 N of force is applied to an object causing it to accelerate at 10 m/s^2. What is the mass of the object?
[tex]~~~~F=ma\\\\\implies m = \dfrac{F}a = \dfrac{200~ N}{10~ ms^{-2}} = 20~ \text{kg}\\\\\text{The mass of the object is 20 kg.}[/tex]
Please help, im stuck on this question
Answer:
A) .27 A
Explanation:
v = ir
i = v/r
equivalent r = 45 * 90 / (45+90) = 30 ohms ( for the two r in parallel)
i = 8v / 30 ohm = 267 mAmps
11. Which of these is a way to make an electromagnet stronger?
a putting a switch in the electrical circuit
b replacing the iron core with a copper core
© replacing the copper wire with plastic wire
wrapping the wire around the iron core more times
Answer:
wrapping around the wire around iron core several times
Explanation:
adding more turns to the coil. increasing the current flowing through the coil.
HELP ME NOW PLEASE !!!
A stone of 4.5 kg mass is falling from the top of a 60 m high multi storey building.Find the kinetic energy of the stone when it reaches the ground.
The kinetic energy will be equal to the potential energy at top
PE=mghm is mass
h is height
PE=4.5(60)(9.8)PE=2646JWhy is it not easy to witness
inertia on Earth?
A. Magnetism is much stronger.
B. Gravity and friction are always acting on
objects.
C. Our mass is too small.
D. Our mass is too large.
2. What do you understand by balanced and unbalanced force
Balanced forces are forces that do not result to change in motion while unbalanced forces are forces that result to change in motion.
What is force?Force is defined as the product of mass and acceleration of an object. That is Force = mass × acceleration.
Balanced force is a type of force that do not result to change because the forces are equal in size and opposite.
Unbalanced force is a type of force that result to change because forces on the opposite sides are not equal.
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How much force is needed to accelerate a 100 kg car at a rate of 3 m/s
in what unit do we measure electric current?
Answer:
Ampere
Explanation:
The SI unit of electric current is Ampere (A) after French physicist Andre Ampere who discovered electrical current
What label should mateo place in the marked cell? uses electrical energy provides electrical energy measures electric current controls electric current
The product label which Mateo should place in the marked cell is that it: B. provides electrical energy.
What is a product label?A product label can be defined as a paper-document with specific information about the chemical elements, nutrients, and other chemical compounds that are present in a product and its general use or function.
In this scenario, the product label which Mateo should place in the marked cell shown in the image attached below is that, this product was designed and developed to provide electrical energy, based on the electrical symbol for battery.
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An object of mass weighing 5.24 kilograms is raised to a height of 1.63 meters. What is the potential energy of the object at that height? Note that acceleration due to gravity is 9.8 meters/second2.
A.
65 joules
B.
84 joules
C.
91 joules
D.
1.0 × 102 joules
E.
1.5 × 102 joules
Answer:
84 joules
Explanation:
potential energy = mgh
5.24×1.63×9.8
= 84 joules
A light-year is a unit generally used to express the distance that light travels in one year. Which of these can be expressed in the light years?
A] the age of a rock
B] the distance between two stars
C] the speed at which the earth revolves around the sun
D] the time earth takes to complete a revolution around the sun
The option that can be expressed in light years is " the distance between two stars." The correct option is B.
What is a light year?A light-year is a unit of distance used to measure astronomical distances. It is defined as the distance that light travels in one Earth year in the vacuum of space, which is approximately 9.46 trillion kilometers (5.88 trillion miles). Light travels at a speed of about 299,792,458 meters per second (or approximately 186,282 miles per second), which means that in one year, light can cover a distance of 9.46 trillion kilometers. Light years are commonly used to measure the distance between stars and galaxies, and since space is vast, other units of distance are often not practical.
Here in the Question,
A] The age of a rock is a measure of time, usually in millions or billions of years, and cannot be expressed in light years, which is a unit of distance.
C] The speed at which the Earth revolves around the sun is measured in kilometers per second or miles per hour and represents a velocity, not a distance. Hence it cannot be expressed in light years.
D] The time it takes for Earth to complete a revolution around the sun is measured in days or years and is again a measure of time, not distance. So it cannot be expressed in light years.
Therefore, Only B The distance between two stars is a measure of distance, which can be expressed in light years since it is a vast distance and other units may not be suitable.
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